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EP3879176B1 - Chaudière à gaz combustible à hydrogène avec brûleur à prémélange et à flamme - Google Patents

Chaudière à gaz combustible à hydrogène avec brûleur à prémélange et à flamme Download PDF

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Publication number
EP3879176B1
EP3879176B1 EP21160120.8A EP21160120A EP3879176B1 EP 3879176 B1 EP3879176 B1 EP 3879176B1 EP 21160120 A EP21160120 A EP 21160120A EP 3879176 B1 EP3879176 B1 EP 3879176B1
Authority
EP
European Patent Office
Prior art keywords
fuel gas
venturi
hydrogen fuel
oxidiser
fluid communication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21160120.8A
Other languages
German (de)
English (en)
Other versions
EP3879176A1 (fr
Inventor
Tom Collins
Simon Dunne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Thermotechnology Ltd
Original Assignee
Bosch Thermotechnology Ltd
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Filing date
Publication date
Application filed by Bosch Thermotechnology Ltd filed Critical Bosch Thermotechnology Ltd
Publication of EP3879176A1 publication Critical patent/EP3879176A1/fr
Application granted granted Critical
Publication of EP3879176B1 publication Critical patent/EP3879176B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/82—Preventing flashback or blowback
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D23/00—Assemblies of two or more burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/06042—Annular arrangement of burners in a furnace, e.g. in a gas turbine, operated in alternate lean-rich mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/9901—Combustion process using hydrogen, hydrogen peroxide water or brown gas as fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation

Definitions

  • the present invention relates to a hydrogen fuel gas boiler for mixing of hydrogen fuel gas with a source of oxygen (for example, air) and the burning of that mixture.
  • a source of oxygen for example, air
  • the mixing flow pathway 12 extending from the plurality of venturis 8,10 is a single mixing flow pathway common to the plurality of venturis 8,10.
  • the venturi outlets 24 are uniformly distributed in the mixing flow pathway 12. As shown in Figure 1 , the venturi outlets 24 are uniformly distributed across the entire cross-sectional flow area of the mixing flow pathway 12. The venturi outlets 24 are uniformly distributed in that they are evenly spaced across the flow area of the mixing flow pathway 12 to introduce fuel and air from the venturi outlets 24 evenly within the mixing flow pathway 12. This promotes a rapid formation of a fuel and air mixture within the mixing flow pathway 12.
  • venturi outlets are arranged with three venturi outlets 108 located in a triangular pitch centred on an imaginary point 110, with the remaining ten venturi outlets 112 being located in a concentric circle which is also centred on an imaginary point 110.
  • the venturi outlets in the concentric circle are equi-spaced from each other i.e. the spacing between neighbouring venturi outlets is the same along the circumference of the circle.
  • the venturi outlets lie in the same plane.
  • the mixing flow pathway 12 is configured to present unobstructed and uncongested passage for fluid flowing between the plurality of venturis 8,10 and the burner 6.
  • the fluid has a clear passage through the mixing flow pathway without flowing over or around features (for example, protuberances) in the mixing flow pathway 12 which tend to promote swirl, eddy currents and/or turbulence.
  • the hydrogen fuel gas inlets 16 of each of the plurality of venturis 8,10 have a thermal effusivity of at least 8 000 J ⁇ s -0.5 ⁇ m -2 ⁇ K -1 .
  • Materials providing such a thermal effusivity include Stainless Steel Series 400. In examples, the thermal effusivity is at least 10 000 J ⁇ s -0.5 ⁇ m -2 ⁇ K -1 .
  • Materials providing such a thermal effusivity include Aluminium and Copper. These comparatively high levels of thermal effusivity allow the plurality of venturis 8,10 to perform the function of a flame arrester.
  • the present invention also provides a heating system having a boiler with a plurality of venturis, wherein the hydrogen fuel gas inlet is in fluid communication with a source of hydrogen fuel gas.
  • an appliance 2 (specifically a boiler) having a mixer 4" to mix together fuel and oxidiser, and a burner 6" to burn a mixture of fuel and oxidiser from the mixer 4".
  • the mixer 4" has one venturi 8", and a single mixing flow pathway 12" extending from the one venturi 8", the mixing flow pathway 12" being configured to provide fluid communication between the one venturi and the burner.
  • a portion of a fluid communication pathway between the mixing chamber 14" of the venturi and the source of fuel, namely the hydrogen fuel gas inlet 16, is a flame arrester and has a hydraulic diameter less than or equal to the MESG (Maximum Experimental Safe Gap) for the fuel gas and gaseous oxidiser mixture. That is, the maximum dimension of the hydrogen fuel gas inlet 16 is less than or equal to the minimum MESG.
  • MESG Maximum Experimental Safe Gap
  • the portion is a restriction in the fluid communication pathway between the mixing chamber 14" of the venturi and the source of hydrogen fuel gas.
  • the portion is the hydrogen fuel gas inlet 16".
  • the MESG is the minimum for hydrogen fuel gas and gaseous oxidiser mixture at any equivalence ratio.
  • venturi 8 functions effectively to arrest upstream progression of a flame in the event of a flashback.
  • a flame arresting function is provided by the portion of the fluid communication pathway (fuel inlet 16" in relation to Figure 3 ) being less than or equal to the minimum MESG (Maximum Experimental Safe Gap) for the fuel gas and gaseous oxidiser mixture (as described above in relation to Figure 3 ) and also by the portion of the fluid communication pathway having a thermal effusivity of at least 8 000 J ⁇ s -0.5 ⁇ m -2 ⁇ K -1 .
  • the boiler 2" is a hydrogen fuel gas boiler and may be provided in a system having a supply of fuel in fluid communication with the fuel inlets 16" of the boiler 2".

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Claims (4)

  1. Chaudière à gaz combustible hydrogène (2, 2") comprenant un mélangeur (4, 4'') pour mélanger ensemble un gaz combustible hydrogène et un oxydant, et un brûleur (6, 6") pour brûler un mélange du gaz combustible hydrogène et de l'oxydant provenant du mélangeur (4) ;
    dans laquelle le mélangeur (4, 4'') comprend au moins un venturi (8, 8", 10) et un chemin d'écoulement de mélangeage unique (12, 12'') s'étendant depuis l'au moins un venturi (8, 8", 10), le chemin d'écoulement de mélangeage (12, 12'') étant configuré pour fournir une communication fluidique entre l'au moins un venturi (8, 8'', 10) et le brûleur (6, 6'') ;
    dans laquelle le ou chaque venturi (8, 8'', 10) comprend une chambre de mélangeage (14, 14''), une entrée de gaz combustible hydrogène (16, 16'') pour fournir une communication fluidique entre la chambre de mélangeage (14, 14'') et une source du gaz combustible hydrogène (18, 18''), une entrée d'oxydant (20, 20'') pour fournir une communication fluidique entre la chambre de mélangeage (14, 14'') et une source de l'oxydant (22, 22''), et une sortie de venturi (24, 24'') pour fournir une communication fluidique entre la chambre de mélangeage (14, 14'') et le chemin d'écoulement de mélangeage (12, 12") ;
    dans laquelle la sortie de venturi (24, 24'') du ou de chaque venturi (8, 8'', 10) s'ouvre dans le chemin d'écoulement de mélangeage unique (12, 12") ;
    caractérisée en ce que
    une partie d'un chemin de communication fluidique entre la chambre de mélangeage (14, 14'') du ou de chaque venturi (8, 8", 10) et la source de gaz combustible hydrogène (18, 18'') est un arrête-flamme ;
    en ce que l'entrée de gaz combustible hydrogène (16, 16'') du ou de chaque venturi est ladite partie du chemin de communication fluidique et en tant que telle est l'arrête-flamme et a un diamètre hydraulique inférieur ou approximativement égal à l'interstice expérimental maximal de sécurité (IEMS) pour le mélange de gaz combustible hydrogène et d'oxydant gazeux ; en ce que
    ladite partie du chemin de communication fluidique a une effusivité thermique d'au moins 8000 J·s-0,5·m-2·K-1 ; et en ce que
    l'interstice expérimental maximal de sécurité (IEMS) est l'interstice expérimental maximal de sécurité (IEMS) minimum pour le mélange de gaz combustible hydrogène et d'oxydant gazeux à un quelconque rapport d'équivalence.
  2. Chaudière à gaz combustible hydrogène selon la revendication 1, dans laquelle l'au moins un venturi (8, 8'', 10) est une pluralité de venturis (8, 8'', 10), et le chemin d'écoulement de mélangeage unique est commun à, et s'étend depuis, la pluralité de venturis (8, 8'', 10) .
  3. Chaudière à gaz combustible hydrogène selon l'une quelconque des revendications précédentes, dans laquelle la totalité de l'oxydant pour le gaz combustible hydrogène brûlé au brûleur (6, 6") est fournie à travers le ou chacun des venturis (8, 8", 10).
  4. Système, comprenant une chaudière à gaz combustible hydrogène (2, 2") selon l'une quelconque des revendications précédentes.
EP21160120.8A 2020-03-13 2021-03-02 Chaudière à gaz combustible à hydrogène avec brûleur à prémélange et à flamme Active EP3879176B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2003682.8A GB2593164B (en) 2020-03-13 2020-03-13 Flame arresting

Publications (2)

Publication Number Publication Date
EP3879176A1 EP3879176A1 (fr) 2021-09-15
EP3879176B1 true EP3879176B1 (fr) 2024-07-03

Family

ID=70453565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21160120.8A Active EP3879176B1 (fr) 2020-03-13 2021-03-02 Chaudière à gaz combustible à hydrogène avec brûleur à prémélange et à flamme

Country Status (2)

Country Link
EP (1) EP3879176B1 (fr)
GB (1) GB2593164B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114542977A (zh) * 2022-02-28 2022-05-27 清华大学 天然气掺氢装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748111A (en) * 1971-06-11 1973-07-24 W Klose Flame arrestor
GB2107041B (en) * 1981-09-29 1985-01-16 Coal Ind Device for extracting and burning methane
US4845952A (en) * 1987-10-23 1989-07-11 General Electric Company Multiple venturi tube gas fuel injector for catalytic combustor
NL9400280A (nl) 1994-02-23 1995-10-02 Stichting Energie Werkwijze voor de verbranding van hoogreaktieve gasvormige lucht/brandstof-mengsels en branderinrichting voor het uitvoeren van deze werkwijze.
US6007325A (en) * 1998-02-09 1999-12-28 Gas Research Institute Ultra low emissions burner
US6699035B2 (en) * 2001-09-06 2004-03-02 Enardo, Inc. Detonation flame arrestor including a spiral wound wedge wire screen for gases having a low MESG
CN2653323Y (zh) 2003-09-12 2004-11-03 张润恒 氢氧锅炉燃烧装置
JP6981053B2 (ja) 2017-06-08 2021-12-15 三浦工業株式会社 水素燃焼ボイラ

Also Published As

Publication number Publication date
GB202003682D0 (en) 2020-04-29
GB2593164B (en) 2025-03-12
EP3879176A1 (fr) 2021-09-15
GB2593164A (en) 2021-09-22

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